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SECTION 22: HEATING AND AIR CONDITIONING
30
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
FIGURE 34:
CONDENSER FAN SPEED IN RELATION
WITH HIGH SIDE PRESSURE
For details about electrical wiring, refer to
“A/C
and Heat system”
in the master wiring diagram.
FIGURE 35: CONDENSER FAN MOTOR
22322
7.4.2 Condenser Fan Motor Removal
1. Set the battery master switch to the
“Off”
position.
2. Disconnect wiring from terminals on motor.
Tag each wire to aid in identification at time
of reconnection.
3. Remove the four hexagonal head cap
screws retaining the fan motor assembly to
the mounting support.
4. Remove
the
motor.
7.5 RECEIVER
TANK
The receiver tank is located in the condenser
compartment (Figure 36). The function of the
receiver tank is to store the liquid refrigerant.
During normal operation, the level of the
refrigerant should be approximately at the mid-
point of the lower sight glass.
FIGURE 36: RECEIVER TANK
In case of extreme pressure there will be a rise
in the liquid receiver tank. A
pressure relief
valve
will break at 450 psi and relieve the
receiver tank pressure.
MAINTENANCE
Check refrigerant level and add if necessary,
every 12 000 miles or twice a year, whichever
comes first.
The receiver tank incorporates an inlet valve on
the inlet side (upper section) which allows the
tank to be isolated or serviced. An outlet valve
on the outlet side (lower section) permits
complete isolation from the rest of the system.
During
normal operation
, inlet and outlet shut-
off valves are in backseated position (stem out).
When connecting a gauge to the service port,
make sure the shut-off valve is in backseated
position because the service port is not fitted
with a Schrader valve.
7.6 FILTER-DRYER
A filter-dryer, also located in the condenser
compartment, is installed on the liquid refrigerant
line after the receiver tank. It is used to absorb
moisture and foreign matter from refrigerant
before it reaches the expansion valves.
The filter-dryer should be replaced after a
severe system failure, after a prolonged
exposure and most important, when the
moisture indicator sight glass turns to pink.
7.6.1 Replacement of the Filter-Dryer After
Pumping Down
The filter-dryer is of the disposable type. When
replacement is required, remove and discard the
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